Ba_2SiO_4セメント硬化体の耐硫酸性

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The test prisms of 10×10×40 mm were made of Ba_2SiO_4 mortars with a Ba_2Si0_4-sand ratio of 1:2 and a water-Ba_2SiO_4 ratio of 0.65. After humid air curing for 3 days, the test prisms were immersed in 0.1, 0.3, 1.0, 3.0, 10.0 and 30.0 wt. % H_2SO_4 Solution for I to 28 days. The sulfuric acid resistance was estimated from the compressive strength and the change in weight of immersed test prisms. The reaction products were identified by X-ray diffraction method and microscopic observation. The results obtained were summarized as follows. (1) When the test prisms were immersed in 0. 1 and 0.3% H_2S0_4 solutions for 28 days, their compressive strengths fell respectively to 13 and 12 kg/cm^2 from 313kg/cm^2 and their weight decreased. On the other hand, when the test prisms were immersed in 3.0 and 10.0% H_2S0_4 solutions for 28 days, their compressive strengths became 148 and 84 kg/cm^2 respectively and their weight increased. (2) The above mentioned high resistance against 3.0 and 10.0% H_2SO_4 solution resulted mainly from the compact textures of BaSO_4 and amorphous silica, which were formed by the reaction between Ba_2SiO_4 and H_2SO_4. (3) The low resistance against 0.1 and 0.3% H_2SO_4 Solutions was mainly due to the porous textures of BaSO_4 and amorphous silica. These porous textures were formed by the reaction of H_2SO_4 and barium silicate hydrate which were produced from Ba_2SiO_4 during the period of immersion. They were also formed by precipitation of BaSO_4 on the outer parts of test prisms.
社団法人日本材料学会の論文
1977-04-15

Ba_2SiO_4セメント硬化体の耐硫酸性

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